Saw-mill head-block



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E'. au I. D. PARKER.

SAW MILL HEAD BLOCK: No. 256,157.l Patented Apr. 11.1882.

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E. 851. D. PARKER.

WITNESSES yam - I WQ 69W@ INVENTOR i UNITE" STATES PATENT OFFICE.

EZRA PARKER AND ISAAC D. PARKER, OF PLAINFIELD, ASSIGNORS TO H. St F. J. L. BLANDY, OF ZANESVILLE, OHIO.

SAW-MILL HEAD-BLOCK.

SPECIFICATION forming part of Letters Patent No. 256,157, dated` April 11, 1882,

Application filed December 17, 1R81.

To all whom 'it may concern:

Be it known that we, EZRA PARKER and ISAAC D. PARKER, of Plaintield, in the county of Coshocton and state of Ohio, haveinvented certain new and useful Improvements in Saw- Mill Head-Blocks; and we do hereby declare the following to be a full, clear, and eXact description ofthe invention, such as will enableV others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this speciticaton.

Our invention relates to saw-mills; and it consists in an improvement in lever headblocks, or in any other devices where pawls can or may be used.

This improvement being used in sawmills necessitates the use of only one lever and one standard-quadrant instead of three. We also have a device whereby the knees of a headblock may besquared instantly and with certainty, thus saving the trouble of calculation and measurement.

In the drawings we show one manner of constructing our device adapted to be used in lever head-blocks.

Figure l represents a plan view, the lever being broken 0E. Fig. 2 represents a longitudinal sectional view taken through the line a: x, in Fig. 1, showing the quadrant down, the pawls bein gen ga ged with the ratchet-wheel. Fig. 3 is a view in side elevation of our device, taken through the line yy. This view shows-the pawls disengaged from the ratchet-wheels. Fig. 4representsa perspective view of a portion of the lever head-block, showing the manner of adjusting the blocks when one knee is in advance ofthe other and they are to be squared.

Fig. 5 represents a section taken through the center of the shafts. This view shows the shafts terminating in the center ofthe lever.

In the drawings, A represents a saw-mill carriage,on which rest the head-blocks A' A'. On the head-blocksare placed knees having racks on the under side, as shown in Fig. 4. The racks are adapted to slide in grooves in the head-block, and are operated by means of pinions c and c', that are attached to the shafts C and C'. The shafts do not connect, but revolve independent of each other, as shownin Fig. 5. They are supported by boxes d d, that (No model.)

are attached to the carriage A. To the shafts C and C' -are secured ra tenet-wheels D and D', as shown in Fig. l. l

Between the ratchet-Wheels is attached a movable lever, E, to the shafts C and C'. To the lever E are attached pawls F and F', that operate independent of each other and engage with the teeth ofthe ratchet-wheels D and D. These pawls F and F' have pins or projections h 71., extending from their sides, which connect with quadrants Gr and G', or their equivalent devices, for liftingpawls. They are secured tothe carriage Aby means ofa hinge or equivalent joint. These quadrants are raised and lowered by independent bell-cranks e and e', the bell-cranks being secured to a standard-icl ver head-quadrant, H, which is permanently attached to the carriage A.

To the bell-cranks are secured stirrups f f', and to each stirrup are secured rods g and g', which pass through the saw-mill carriage to the sawyer's position, so that the device can be operated from either side of the saw-mill.

I represents, pawls that are attached to the standard-lever head-block and operate independently of each other. They engage with the ratchet-wheels D D', and prevent them from turning back when the pawls F and F' are disengaged from the ratchet-wheel. They are adapted to be raised and lowered similar to the pawls F and F', so as to allow the knees B and B' to be drawn back.

J J are lugs attached to the head-block by means of a cord or chain. These lugs are adapted to be placed in holes j in the headblock, and are placed at any desirable distance apart.

To the side of the knees B and B' are secured pins K K, or any othersuitable device. These pins are to be placed so as to come in contact with the pins J J when the knees are IOO ' wheel D, while the pawl on v the opposite side of the lever E is engaged with the ratchetwheel D', as shown in Fig. 2. The lever being operated now will cause the ratchet-wheel to revolve and turn the shaft C', to which the pinion c is attached. This pinion, meshing with therack b,willforce thekneeB forward. When carried forward t0 the desired distance the quadrant Gr is lowered, aud both ratchet-wheels will revolve equally.

When it is desirable to square the knees thel pawls are disengaged from the ratchet-wheels and the knees drawn back until the projection K strikes the pin J. This enables the operator to adjust them instantly without calculation and with certainty.

What we claim is- 1. In a saw-mill head-block, the combination,

with the lever and its quadrant for adjusting the head-block, ot' two independent quadrants hinged upon the carriage, one on either side of the lever, and provided with bell-crank levers and adapted to raise the pawls that operate the ratchets which regulate the adjustment of the knees, substantially as set forth.

2. In a saw-millhead-block, the combination, with the lever and its quadrant, of two hinged quadrants adapted to raise the pawls that operate the ratehets, and connected by suitable devices to operating-rods, which latter pass through the carriage to the sawyers posit-ion, substantially as set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

EZRA PARKER.

ISAAOD. PARKER. Witnesses:

W. H. WILMoT, J. N. HOWARD. 

